Erosion is the removal of the products of weathering from where they were formed (the wearing away of rocks).
Transport is when weathered rock fragments fall away under gravity or are carried away by flowing water. 3
examples of transport agents are: water, wind and glaciers.
At slow speeds particles will fall to the bottom of the stream as sediment (this is deposition).
Largest particles are deposited first and then decrease in size. In this way particles are sorted according to
By studying sediment, scientists can tell a lot about where it came from and how it was carried: 1) Particle
size - If its particles are similar sizes the sediment is well sorted. (Dust carried by wind is well sorted) If
they are different sizes, the sediment is poorly sorted (poorly sorted sediment suggests an initial strong
current which slows down suddenly. 2) Particle shape - A glacier cushions rock fragments and protects them from
collisions so that they stay sharp and jagged. A fast flowing river flings rocks and stones against each other
so they are smooth and rounded. The more vigorous the collision, the smoother the fragment. 3) The structure of
If you threw a shovel full of soil sand and gravel into a very deep glass tank full of water, you would expect
to see a sedimentary structure made up of different layers. The top layer would be the smallest and lightest
particles such as sand and loom (silt). The lowest layers would be the heavier and larger particles such as
pebbles and stones.